Delivery Area – Please Check Before Ordering This product is only available for delivery to the postcode areas listed below. AL CB E HA EN NW SG UB WD N CM17–CM24 HP1–HP4 IP24–IP29 LU1–LU6 MK (except MK18) PE1–PE8 PE19 PE26–PE29 Stock Clearance - Limited Availability This product is supplied as a pallet of 48 Celotex GA4000 insulation boards, each measuring 2400mm x 1200mm x 25mm. Celotex GA4000 is a high-performance, general-purpose PIR insulation board suitable for a wide range of floor, wall and roof applications. At 25mm thick, it provides an effective solution where additional thermal insulation is required without taking up excessive space within the building structure. The boards can be used in applications including pitched and flat roofs, concrete slab floors, timber floors, cavity walls, internal wall linings and external wall sheathing. Celotex GA4000 features low-emissivity foil facings on both sides, helping to improve thermal performance when used alongside an appropriate airspace. Manufactured from rigid polyisocyanurate (PIR), Celotex GA4000 provides a low thermal conductivity of 0.022 W/mK, allowing useful improvements in thermal performance from a relatively thin insulation layer. The 25mm thickness makes it particularly suitable for refurbishment projects, restricted spaces and applications where maintaining internal floor or wall dimensions is important. Celotex GA4000 is lightweight and easy to handle, helping to simplify transportation, cutting and installation on site. Despite its low weight, the rigid PIR core provides excellent durability and dimensional stability for long-term use when correctly installed. The insulation is manufactured using a blowing agent with zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), helping it contribute towards more energy-efficient building construction. Key Features Supplied as a pallet of 48 boards 25mm thick rigid PIR insulation board Thermal conductivity of 0.022 W/mK Suitable for floors, walls and roofs Ideal for areas with limited available space Low-emissivity foil facings Lightweight and easy to handle Easy to cut and install High thermal performance relative to thickness Durable rigid construction Helps reduce heat loss and improve energy efficiency Zero Ozone Depletion Potential (ODP) Low Global Warming Potential (GWP) Suitable for new-build and refurbishment projects Helps reduce thermal bridging and cold spots Specifications Brand: Celotex Product Range: GA4000 Quantity: 48 boards Thickness: 25mm Length: 2400mm Width: 1200mm Material: Polyisocyanurate (PIR) Thermal Conductivity: 0.022 W/mK Facing: Low-emissivity aluminium foil Board Type: Rigid insulation board Application: Floors, walls and roofs Applications 25mm Celotex GA4000 can be used across a variety of construction applications, including: Pitched roof insulation Flat roof insulation Concrete slab floors Suspended timber floors Cavity wall applications Internal wall insulation External wall sheathing Timber frame construction Refurbishment and renovation projects Its relatively slim 25mm profile makes it especially useful where space is restricted or where a supplementary layer of insulation is required. Storage Celotex GA4000 should be stored flat in a dry, covered location and protected from moisture and prolonged exposure to weather conditions. Boards should be kept clear of the ground and stored away from sources of damage. If temporary outdoor storage is unavoidable, the boards should be completely covered with suitable waterproof sheeting while allowing adequate ventilation. Certification Celotex GA4000 is manufactured to recognised industry standards and is suitable for use in a variety of building applications when installed in accordance with the manufacturer's recommendations. Celotex insulation products have also achieved favourable environmental ratings within the BRE Green Guide for applicable constructions. Frequently Asked Questions What is PIR insulation? PIR, or polyisocyanurate, is a rigid insulation material widely used in modern construction. It provides excellent thermal performance with relatively little thickness, making it particularly useful where available installation space is limited. What applications can 25mm Celotex GA4000 be used for? 25mm Celotex GA4000 can be used for a variety of floor, wall and roof applications, including pitched roofs, flat roofs, concrete floors, timber floors, cavity walls and internal wall insulation. What is the thermal conductivity of Celotex GA4000? Celotex GA4000 has a thermal conductivity of 0.022 W/mK, providing high thermal resistance relative to the thickness of the board. Why would I choose 25mm Celotex insulation? The 25mm board is particularly useful where installation depth is limited. It can provide additional insulation without significantly increasing the thickness of a floor, wall or roof construction. Can Celotex GA4000 be used for both internal and external applications? Yes. Depending on the construction specification, Celotex GA4000 can be incorporated into both internal and external building elements, including floors, walls and roofing systems. Is Celotex GA4000 easy to install? Yes. The boards are lightweight, rigid and relatively easy to cut to size using suitable hand tools. Accurate cutting and tightly fitted joints are important for achieving the best thermal performance. What tools are required to cut Celotex GA4000? The boards can typically be cut using a fine-toothed saw or appropriate insulation cutting tool. Suitable measuring equipment and PPE should also be used during installation. Does Celotex GA4000 resist moisture? PIR insulation has good resistance to moisture, and the foil facings provide additional protection. However, the boards should still be stored and installed in accordance with Celotex guidance and should not be left exposed to persistent moisture. Is Celotex GA4000 environmentally friendly? Celotex GA4000 is manufactured using a blowing agent with zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP). Its high thermal performance can also help reduce energy consumption and associated heating costs over the life of a building. How long does Celotex GA4000 insulation last? When correctly specified, installed and protected within the building construction, rigid PIR insulation can provide effective thermal performance for the lifetime of the building. Is Celotex GA4000 fireproof? No. Celotex GA4000 should not be described as fireproof. It is a combustible PIR insulation product and should be installed as part of a properly designed construction that meets the relevant fire safety and building regulation requirements.
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